AN UNINTENTIONAL ROOF FALL OCCURRED ON THE NO. 1 SECTION, 180'FROM THE FACE IN THE NO.1 ENTRY (RETURN). THE FALL MEASURED APPROX. 30'LONG X 20'WIDE & 4 1/2'- 6 1/2' HIGH. THE FALL DID NOT AFFECT AIR FLOW ON THE PASSAGE OF MEN. THIS AREA WAS DEVELOPED 4/26/06.